10 MJ超导储能磁体临界电流分布及热稳定性分析

Analysis on distribution of critical current and thermal stability of10MJ SMES magnet

本文介绍了一种由准各向同性股线(Q-IS)和直接堆叠带材导体(STC)绕制而成的高温超导储能磁体。计算了磁体的临界电流,得到了临界电流密度分布,在绝热近似下分析了磁体的最小失超能(MQE)和失超传播速度(QPV)等热稳定性能。结果表明,STC绕制的磁体临界电流更大,而Q-IS制成的磁体临界电流密度分布均匀性具有明显优势,当归一化电流i=0.6、0.7、0.8、0.9时,Q-IS绕制的磁体的MQE分别是STC绕制磁体的1.15、1.22、1.42、3倍。对于失超传播速度(QPV),Q-IS绕制的磁体的仿真值大约是STC绕制磁体仿真值的82%~92%。

It was presented that a high temperature superconducting(HTS)energy storage(SMES)magnet was wound by quasi-isotropic strand(Q-IS)and directly stacked tape conductor(STC).The critical currents of two kinds of magnets were calculated and the critical current density distribution was obtained.Besides,the thermal stability performances were analyzed in the adiabatic approximation,such as minimum quench energy(MQE)and the quenching propagation velocity(QPV).The results show that the magnet made of STC has a higher critical current,while the magnet made of Q-IS has an obvious advantage in the distribution uniformity of the critical current density.When the normalized current i=0.6,0.7,0.8 and 0.9,the MQE of Q-IS wound magnet is 1.15,1.22,1.42 and 3 times one of STC wound magnet respectively.ForQPV,the simulated value of Q-IS wound magnet is about 82%to 92%of the one of STC wound magnet.